1. Faculty of Life and Environmental Sciences, University of Yamanashi, Yamanashi 400-8510, Japan
2. Center for Life Science Research, University of Yamanashi, Yamanashi, 409-3898, Japan
3. Stem Cell Therapy Laboratory, Advanced Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
4. Division of Stem Cell Therapy, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
5. Laboratory of Stem Cell Therapy, Institute of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
6. Advanced Biotechnology Center, University of Yamanashi, Yamanashi 400-8510, Japan
7. Institute for Stem Cell Biology and Regenerative Medicine, Department of Genetics, Stanford University School of Medicine, California 94305, USA